The inclusion of Mo, Nb and Ta in Pt and PtRu carbon supported electrocatalysts in the quest for improved CO tolerant PEMFC anodes

Papageorgopoulos, Dimitrios; Keijzer, M.A. de; Bruijn, F.A. de

doi:10.1016/s0013-4686(02)00602-3

Cited by 148 publications

(83 citation statements)

References 15 publications

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“…Ternary electrocatalysts based on carbon supported PtRuMo nanoparticles have attracted major attention in recent years for PEMFCs, fuelled with H 2 /CO or low molecular weight alcohols [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Mo is a cheaper and more abundant transition metal than Pt and Ru.…”

Section: Introductionmentioning

confidence: 99%

“…This difficulty comes from the inability to synthesize PtRuMo nanoparticles supported on carbon of a controlled chemical composition and particle size is still complicated. The synthesis methods used can be classified in (i) one-step method or simultaneous incorporation of the three metals [31,33,[35][36][37], and (ii) two-step methods or sequential incorporation of Mo and PtRu nanoparticles [27,32]. While a variety of PtRuMo catalysts have been prepared by one-step methods, the ability to control the size and composition is limited due to the propensity of aggregation of metals at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

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Carbon-Supported PtRuMo Electrocatalysts for Direct Alcohol Fuel Cells

et al. 2013

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Abstract:The review article discusses the current status and recent findings of our investigations on the synthesis and characterization of carbon-supported PtRuMo electrocatalysts for direct alcohol fuel cells. In particular, the effect of the carbon support and the composition on the structure, stability and the activity of the PtRuMo nanoparticles for the electrooxidation of CO, methanol and ethanol have been studied. Different physicochemical techniques have been employed for the analysis of the catalysts structures: X-ray analytical methods (XRD, XPS, TXRF), thermogravimetry (TGA) and transmission electron microscopy (TEM), as well as a number of electrochemical techniques like CO adsorption studies, current-time curves and cyclic voltammetry measurements. Furthermore, spectroscopic methods adapted to the electrochemical systems for in situ studies, such as Fourier transform infrared spectroscopy (FTIRS) and differential electrochemical mass spectrometry (DEMS), have been used to evaluate the oxidation process of CO, methanol and ethanol over the carbon-supported PtRuMo electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon-Supported PtRuMo Electrocatalysts for Direct Alcohol Fuel Cells

et al. 2013

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“…However, even traces (ppm) of carbon monoxide (CO) in the hydrogen feed gas can cause serious performance degradation of PEMFCs [1][2][3][4][5][6]. In order to achieve higher power output with CO containing feed in fuel cells, the utilisation of bimetallic anode catalysts, PtM/C, have been largely investigated [1][2][3][6][7][8][9][10][11][12]. The influence of Ru, Mo, Sn with Pt as anode catalyst is intensively studied.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of a PEM Fuel Cell During Electrochemical CO Oxidation on a PtRu Anode

et al. 2008

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The dynamic behaviour of a single PEM fuel cell (PEMFC) with a PtRu/C anode catalyst using CO containing H 2 as anode feed was investigated at ambient temperature. The autonomous oscillations of the cell potential were observed during the galvanostatic operation with hydrogen anode feed containing CO up to 1000 ppm. The oscillations were ascribed to the coupling of the adsorption of CO (the poisoning step) and the subsequent electrochemical oxidation of CO (the regeneration step) on the anode catalyst. The oscillations were dependent on the CO concentration of the feed gas and the applied current density. Furthermore, it was found that with CO containing feed gas, the time average power output was remarkably higher under potential oscillatory conditions in the galvanostatic mode than during potentiostatic operation. Accompanying these self-sustained potential oscillations, oscillation patterns of the anode outlet CO concentration were also detected at low current density (\100 mA/cm 2 ). The online measurements of the anode outlet CO concentrations revealed that CO in the anode CO/H 2 feed was partially electrochemically removed during galvanostatic operation. More than 90% CO conversion was obtained at the current densities above 125 mA/cm 2 with low feed flow rates (100-200 mL/min).

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“…Upon CO saturation of the solution, CO displaces virtually all of the hydrogen from the surface, as seen by the total suppression of the hydrogen adsorption-desorption charges. The peak potential (E p ) for CO oxidation from PtRu/C lies at a much lower value than that for Pt/C, 27 an outcome of the higher activation of H 2 O and a weakening of the CO-metal bond on the bimetallic surface.…”

Section: Resultsmentioning

confidence: 93%